On Dec 13, 2:34 am, Dennis Lee Bieber <wlfr...@ix.netcom.com> wrote: > On Sat, 12 Dec 2009 10:46:01 +0100, census <cen...@no-email.de> > declaimed the following in gmane.comp.python.general: > > > > > def scramble (a): return (a + 13) % 256 > > I'll see your modulo rot 13 and raise with a exclusive or... > > -=-=-=-=- > > import sys > > def scramble(block, key="don't look"): > copies = int(len(block) / len(key)) + 1 > keystring = key * copies > return "".join([ chr( ord(block[i]) > ^ ord(keystring[i])) > for i in range(len(block))]) > > def process(fin, fout, key=None): > din = open(fin, "rb") > dout = open(fout, "wb") > while True: > block = din.read(1024) > if not block: break > if key is None: > block = scramble(block) > else: > block = scramble(block, key) > dout.write(block) > dout.close() > din.close() > > if __name__ == "__main__": > fin = sys.argv[1] > fout = sys.argv[2] > if len(sys.argv) > 3: > key = sys.argv[3] > else: > key = None > process(fin, fout, key) > -- > Wulfraed Dennis Lee Bieber KD6MOG > wlfr...@ix.netcom.com HTTP://wlfraed.home.netcom.com/
Thank you all. Dennis I really liked you solution for the issue but I have two question about it: 1) My origin file is Text file and not binary 2) I need to read each time 1 byte. I didn't see that on your example code. Thanks again All of you Dave -- http://mail.python.org/mailman/listinfo/python-list
